Armed men stand near armoured personnel carriers, with a Russian flag on top one of the vehicles (R), in Slaviansk April 16, 2014. Six armoured troop carriers entered the eastern Ukrainian town of Slaviansk on Wednesday carrying the Russian national flag and the banner of pro-Russian separatists, a Reuters eyewitness said. The sign on the building reads, "White Night cafe". REUTERS/Gleb Garanich (UKRAINE - Tags: MILITARY POLITICS CIVIL UNREST)

Armed men stand near armoured personnel carriers, with a Russian flag on top one of the vehicles (R), in Slaviansk April 16, 2014. Six armoured troop carriers entered the eastern Ukrainian town of Slaviansk on Wednesday carrying the Russian national flag and the banner of pro-Russian separatists, a Reuters eyewitness said. The sign on the building reads, "White Night cafe". REUTERS/Gleb Garanich (UKRAINE - Tags: MILITARY POLITICS CIVIL UNREST)